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May Weather in San Marcos, Mexico

Last updated: August 27, 2025

In May, the average temperature in San Marcos, Mexico is a pleasant 22°C (73°F). During this time, temperatures can range from a cool 7°C (46°F) at the minimum to a warm 34°C (94°F) at the maximum. Expect around 15 mm (0.6 in) of precipitation over 4 days, accompanied by an average humidity level of 52%. Enjoy the mild and varied weather!

May Temperature in San Marcos

In May in San Marcos, the average temperature is 22°C (73°F). Maximum temperatures can reach up to 34°C (94°F), while minimums can drop as low as 7°C (46°F). This makes San Marcos a great destination for travelers seeking mild weather and the opportunity to enjoy both warm days and cool evenings.

May Weather in San Marcos: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, May typically has an average temperature of 22°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec545864687272696965645954
Data source: Temperature data for San Marcos generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in San Marcos

In San Marcos in May, the precipitation amount is 15 mm (0.6 in) occurring over the course of 4 days.

May Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Marcos, May typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec121011915521366712543109
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Marcos

In San Marcos in May humidity is 52%. With an average temperature of 22°C (73°F), this humidity feels like a comfortable blanket, making it ideal for leisurely explorations and outdoor activities as long as you're hydrated and take breaks in the shade.

May Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Marcos is approximately 52%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%62%53%48%52%64%73%71%82%83%82%84%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Marcos

In San Marcos in May, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Marcos, you can check here.

Maximum UV Index Levels in San Marcos for May

The chart shows the monthly maximum UV Index (UVI) for San Marcos in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in San Marcos typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec811131414141414131297
Data source: San Marcos May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in San Marcos Compares to Other Months

Weather in San Marcos varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Marcos, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Marcos, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)12 mm (0.5 inches)70%very high
February Weather15°C (59°F)10 mm (0.4 inches)62%extreme
March Weather18°C (64°F)11 mm (0.4 inches)53%extreme
April Weather20°C (68°F)9 mm (0.4 inches)48%extreme
May Weather22°C (73°F)15 mm (0.6 inches)52%extreme
June Weather22°C (73°F)52 mm (2.1 inches)64%extreme
July Weather20°C (69°F)136 mm (5.4 inches)73%extreme
August Weather21°C (70°F)67 mm (2.6 inches)71%extreme
September Weather18°C (65°F)125 mm (4.9 inches)82%extreme
October Weather18°C (64°F)43 mm (1.7 inches)83%extreme
November Weather15°C (59°F)10 mm (0.4 inches)82%very high
December Weather12°C (55°F)9 mm (0.3 inches)84%high

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